Window construction



Mar'CHI, 19 55 T. HAUCK 2,703,153

5 WINDOW CONSTRUCTION Filed Dec. 29. 1949 6 Sheets-Sheet l INVENTOR mmzm-e H 2 "36 T T wmjgy ATTORNE March 1, 1955 'r. HAUCK 2,703,158

WINDOW CONSTRUCTION Q Filed Dec. 29, 1949 I I s Sheets-Sheet 2 j-T JL 20 INVENTOR T. HAUCK WINDOW CONSTRUCTION 6 Sheets-Sheet 3 March 1, 1955 Filed Dec. 29, 1949 I M f ATTORN March 1', 1955 T. HAUCK 2,703,158

' WINDOW CONSTRUCTION Filed Dec. 29, 1949 s Sh eets-Sheet s INVENTOR I Theodore Haas/E March 1, 1955 Filed Dec; 29. 1949 T. HAUCK WINDOW CONSTRUCTION 6 Sheets-Sheet 6 /""'OIII IIIIII4 INVENTQ R Theodore Ha ack l r flaw,

ATTORNE 6' Uniwd SW This invention relates'to window construction and more particularly to an' improved window unit comprising a conventional double-hung window combined in a novel manner with a novel self-storing storm sash and screen assembly, as well as to certain novel sub-combinations of the window unit. The present invention i's'particularly' useful when'incorporated in windows of the type wherein all of the non-glazed portions of the window are made of metal and the preferred embodiment of the invention will be described in connectionwith such windows. However, as the description proceeds'it will be apparent that the invention may be used in connection with" wooden framewindows as well, and a"niodification of the invention particularly useful in wooden frame windows will also be described, Also dow unit may be used in conjunction with casement type windows. v f

It is 'an object of" the present invention to provide an improved assembly of double-hung window, storm sash and screen that is unusually easy to install and'may be suitable building opening rapidly secured in place in a by relatively unskilled labor. It is another object of the invention to' eliminate the relatively complicated and costly anchoring of the window frame in thebuilding opening that has heretofore'been thought necessary. It is still another object of the invention to provide a combination window unit of this type having sufficient ventilating flexibility to satisfy the varyingdes'ires of different users under widely ,varying atrnospheric. conditions.

It is a further object of the invention to provide such a unit wherein the screen is protected from exposure during winter weather withoutremoval fromthe unit. It is another object of the invention to provide a unit having an improved caulking jointand improved heat insulating properties. It is still another objectof the invention to provide in sucha unit improved means for inhibiting lateral movement of the storm sash and screen and thereby preventing rattling of these window elements. It is a still further object of the inveniton to provlde in a unit of this type improved means for limiting downward movement of the lower sash.,and improved means for retaining the window elements in their uppermost position when desired. Other objects of the invention W111 be in part obvious and in part pointed out hereafter.

The many objects and advantages of the present invention may best be understood and appreciated by reference'to theaccompanyingdrawings which illustrate a windowIunit incorporating a preferred embodiment of the present invention'and'whereinz Figure 1 is a front elevation of a pair of w ndows mco oratin the invention;

F igure is a vertical section taken on the line 22 of Figure 1 and showing the general arrangement of the window unit and its manner of mounting in the bulldmg opening;

Figure 3 isa horizotal sect on ta'kenon the line 3 -3 of Figure l and further showing the general arrangement of the principal parts of the two window units of Figure 1;

Figure 4 is a vertical section taken on the l1ne4-4 of Figure 1 and showing the spring-biased detent for retaiuing the storm sashes and screen in their uppermost positions;

Figure 5 is a horizontal section taken on the l1 ne 5-5 of Figure 4 and showing one of the track-retaining lugs;

Figure 6is-a vertical section taken on the l1ne-66 of Figure 4,-i. e., at right angles to the section of Figure 4 portions of the present winand showing the cooperation between the spring-biased detent and the notch in the frame of the lower storm sash;

Figure 7 is an enlarged detail view of the storm sash notch and detent shown in Figure 6; p

Figure 8 is a detall view, similar to Figure 7 but taken on the line 88 of Figure 4, and showing the configura tion of: the notches in the frames storm sash; v I

Figure 9 is a "vertical section taken on the line 9-9 of Figure 3 and illustrating the construction of the safety of the screen and upper v latch, and also certain details of the anti-rattling springs;

Figure 10 is a vertical section taken on the line 1010 of Figure 9, i. 'e.;' at righ't'angles to the section of Figure 9"and showing further'details of the mounting of the anti-rattling springs; p

Figure 11 is a perspective view of a portion of the 'auxi iary frame showing the 'manner of mounting. the

tracks therein;

Figure 12 is a detail view of one of the screen latches; Figure 13'is a detail view showing the lower portion of one of the track mefbers in section and a stop for limiting downward movement of the upper storm sash;

Figure 14 is a vertical section through a modified screen and storm sash assembly particularly suited for use with wooden frame windows;

Figure 15 is a front elevation of the structure of Figure 14 showingthe drainage ports, commonly called weep holes: and indicating the means for adapting this construction to window openings of different sizes.

1 Figures 16 and 17 are vertical sections taken on the mes Figure 18 1s an on the line 18-18 construction of the drainage ports; and

approximately vertical sectiontaken Figure 19 is a perspective detail view of the corner of Z the two. units are of essentially similar construction, only one of the units will be described in detail Referring to the drawings and more particularly to Figure 2, the numeral 10 generally designates a conventional double-hung metal frame window comprising the header 11, jambs 17, upper sash 12, sill 15 and lower sash 14. The conventional window 10 is retained in a building opening by means of what will bedesignate'd hereinatrim-anchor, generally designated 16, which is of generally rectangular shape and includes an outwfardly extending fin 18 that extends outwardly at all sides 0 as to Figure 2, the fin 18 provides a nailing strip whereby the trim-anchor 16 may be secured to the peripheral porgignZO of the building opening as by means of the nails As indicated in Figures 1 and 3, in cases where twoor more window units are-to be located side-by-side in a single window opening the portions of the fin 18 located between each pair of windows may be secured to a portion of the conventional window frame '11 and thus form a mullion. It is evident that where a single Window unit is to be located in 'a building opening the portion of fin 18 which in Figures 1 and 3 forms part of the mullion will be nailed to a peripheral portion of the building opening which receives the window unit.

Referring now to Figures 2 and 3, the frame 1 1 of window 10 is'provided at its header and jambs with an outwardly extending flange 24 which is secured to the fin 18 in any suitable manner such as by means of screws 26 and in this way the trim-anchor 16 anchors the conven- 16--16'and 1717 of Figure 15 respectively and "further showing the drainage ports and adapting means.

of Figure 16 and further showing the thetrim-anchor; Referring to Figures 1 and 3 as wellhereafter. At the sides of the window unit (see Figure 3) the spacing member 28 is omitted and its function is performed by the spacing members 30 that extend forwardly from the flange 24 to engage fin 18 and define enclosure 29. The rear face of the fin 18 is provided with the projections 31 which position the spacing member 30 and thus ensure proper lateral positioning of the window with respect to the trim-anchor 16.

Reverting to Figure 2, at the bottom of the window unit the sill is provided with a pair of downwardly extending fins or flanges 32. A right-angle portion 33 of the trim-anchor 16 extends rearwardly under one of the flanges 32 and upwardly between the flanges to provide means whereby the sill 15 is connected to the trim-anchor by means of screws 26. As at the top of the window, the space defined by par-t 33, flanges 32 and sill 15 is filled with the insulating material 29. The trim-anchor 16 also includes a forwardly and downwardly extending sill 34. After installation of the window unit and erection of the building facing 35, the space between the sill 34 and facing 35 is filled with a suitable caulking material 36. In like manner the space between fin 18 and the facing 35 at the top of the window uni-t is filled with the caulking material 36. Similarly, as shown in Figure 3, the space between the trim-anchor and building facing at the sides of the window is filled with caulking material 36.

Still referring to Figure 2, the trim-anchor 16 includes in addition to the fin 18 and spacing members 27 and 28, a forwardly extending fin 37 which is provided at the top and sides of the window unit with an inwardly extending flange 38. The fin 37, flange 38, spacing member 27 and conventional window frame 11 cooperate to define an auxiliary frame 41 wherein a pair of storm sashes and a screen may be mounted.

Referring to Figures 2 and 3, the inner side portions of the auxiliary frame 41 are provided with the track members and 42 respectively which cooperate with the flange 38 to define the slots 44-4648 and 52-54 respectively. Slidably mounted within the slots 48 and 54, there is an upper storm sash 56 comprising a hollow rectangular frame 58 and a light 60, e. g. a piece of glass, mounted and sealed therein. A similarly constructed lower storm sash 61 comprising a hollow frame 62 and light 63 is slid-ably mounted in the slots 44 and 50. Slidably mounted between these two storm sashes in the slots 46 and 52 there is a screen 64 mounted in a hollow frame 65. As further described hereafter the storm sashes and screen may be vertically moved to give desired ventilation and weather protection under varying Winter and summer conditions. In addition to providing slots for reception of the storm sashes and screens, the track members 40 and 42 act as stiffening members for the frame 41 to help prevent buckling of the frame.

In order to permit ready removal of the window sashes 56 and 61 and screen 64 for cleaning and the like, the track members 40 and 42 are made in sections that are separately detachable from the frame 41. Referring particularly to Figures 3, 5 and 11, the frame 41 is provided with a pair of track-member retaining flanges 68 and 70. The track member 40 is provided with a number of rotatable lugs, such as the lug 72, rotatably mounted on the track member 40 by means of rivets 74 which are secured to the lugs. At their ends each of the lugs 72 has a pair of ears 76 and 78 which are adapted to engage respectively the retaining flanges 68 and to hold the track member securely in place in the frame 41. The inner ends of rivets 74 are flush with the track member 40 and provided with kerfs 80 by means of which the rivets 74 and associated lugs 72 may be rotated with a screw driver to cause the cars 76 and 78 to engage or be detached from the retaining flanges 68 and 70. The track member 40 is also provided with a series of projections 81 that normally engage the flange 68. These projections facilitate proper positioning of the track member with respect to the frame 41 when the track member is inserted in the frame and also prevent undesired relative movement of the track member and frame.

The sec'tionalization of the track members 40 and 42 is best indicated in Figure 11. The track members may be formed of any suitable number of sections but as shown in Figure 1 1 comprise a lower section 82 extending from the bottom of the window unit to the point 84 and including two of the lugs 72, and an upper section 83 extending from the point 88 to the top of the window and provided with two of the lugs 72. When it is desired to remove one of the window elements comprising the two storm sashes and screen from the frame 41, the window elements are moved to their uppermost position where they are retained in place by mechanism described below. The lugs 72 of the lower section 82 are then rotated to disengage this section of track member 40 from the frame 41 and the corresponding section of track member 42 is removed. Thereafter one or more of the window elements may be lowered and removed from the frame 41 as indicated in phantom in Figure 14, by drawing the lower portion of the sash inwardly and causing the sash to pivot about its upper edge. The flange 38 of frame 41 prevents the sash from falling outwardly as it is removed. Reverting to Figure 11, it will be noted that the upper end of track section 82 is spaced from the lower end of section 83 by an amount equal to the distance between points 84 and 88 on the frame 41, and that the distance from sill 34 to point 88 is greater than the height of the window elements. This spacing is to facilitate removal of the window elements from the frame.

In order to retain the window elements in their uppermost positions, a spring-biased detent is provided. Referring to Figures 4, 6, 7 and 8, mounted on the upper outer surface of the track member 40, there is a leaf spring 90 which at its upper end is bent to form a projection 92. A slot 94 is formed in the track member 40 to permit the projection 92 to bear against the side edges of the frames of the window elements. As shown in Figure 7, the frame 62 of the lower storm sash 61 is provided with a V-notch 96 that is engaged by the projection 92 to hold the storm sash in its uppermost position. The projection 92 is resiliently biased to enter the notch 96 to retain the sash 61 in its uppermost position. When it is desired to lower this sash downward manual pressure on the window element causes the projection 92 to be forced outwardly into the space between the track member 40 and fin 37 and the sash can thus be lowered.

Referring to Figure 8, corresponding notches are formed in the frames 65 and 58 of the screen 64 and upper storm sash,56 respectively, but the notches 97 are of a somewhat different configuration from notch 96. Thus notches 97 have a horizontal upper edge which prevents lowering of the upper storm sash and screen by downward manual pressure on these window elements until the projection 92 has been withdrawn from notches 97. The detent and notches cooperate to form an interlock between the window elements which permit lowering of the storm sash 56 and screen 64 only after the storm sash 61 has been moved downwardly to cause the projections 92 to be retracted.

In order to secure desired ventilation, it is frequently desirable that the lower storm sash be positioned a predetermined amount above its lowermost position in contact with sill 34. Referring to Figures 3 and 9 of the drawings, this desired positioning of the lower storm sash is secured by means of a retaining pin 100 which passes through a hole 102 in the track member 42 and extends across the slot 50 of the track member. The pin 100 is mounted on a leaf spring 104 which at its lower end is secured to the track member 42 by a rivet 106 and thus the pin 100 is resiliently urged through the hole 102 into the position shown in solid lines in Figure 9, in which position it engages the lower portion of sash 61. To facilitate withdrawal of the pin 100 from the track member, it is provided with a knob 108 that may be manually grasped. The withdrawn position of the retaining pin is shown in phantom in Figure 9. It is apparent that when the pin 100 is positioned as shown in the solid lines in Figure 9, it will limit downward movement of the lower storm sash 61. The pin 100 also serves as a safety latch to prevent injury to the hands of the user of the window, since the pin must be manually withdrawn from the slot 50 in order to lower the sash 61 the last few inches to its closed position.

In order to inhibit lateral movement of the window elements in their respective slots and prevent rattling of the window elements, a number of specially mounted spring elements are provided. Referring to Figures 9 and 10, a normally arcuate thin spring member 110 is mounted on the hollow frame 65 of the screen 64. The hollow frame 65 is provided with the holes 112 and 114 and the ends of the spring 110 pass through the holes and are curved to ensure that the ends of the spring will remain within the interior of the frame 65. The central portion of the spring 110 bears against the side of slot 52 and thus inhibits lateral movement of the screen 64 within theslot. It should be noted that the spring 110 is looselymounted with respect to the frame 65, i. e., it is not secured in fixed relation to the frame but is freely movable, within limits, in the holes 112 and 114. It has been found that the loose mounting of the spring 110 is especially effective in reducing rattling while at the same time permitting free movement of the screen 64 within its slot. In the eznbodiment here disclosed (see'Figure 1) each of the window elements is provided with four of the springs 110, i. e., two vertically spaced springs on each side of the Window element.

The screen 64 is provided with a pair of spring-biased latches located at the inner side of the screen to prevent opening of the screen from the outside. As shown in Figure 1, the latches 118 and 120 are mounted opposite one another in the sides of screen frame 65 approximately mid-way between the top and bottom of the screen. Referring to Figure 12, each latch comprises a spring-retaining housing 122' effectively secured to. the frame 65 and containing a coil spring 124 which bears at one end against the housing and at its other end against a shoulder 126 of an axially slidable pin 128 in such manner as to urge the pin to the right as shown in Figure 12. Thepin 128 extends through the side wall of frame 65 in one direction, and in the other direction extends through the spring 124 and housing 122 and terminates in a knob 130 that is adapted to be manually grasped. Rightward movement of the pin is limited by a shoulder 132 of knob 130 that bears against a portion of housing 122. The portion of pin 128 extending beyond frame 65 is adapted to engage (see Figure 11) a hole 134 in the lower section 82 of track member 40. It is evident that spring 124 normally holds pin 128 in hole 134 to retain screen 64 in its lower position and that pin 128 may be manually withdrawn by'means of knob 130 when it is desired to raise the screen. The knobs 130 also serve as means whereby the screen may be manually grasped to raise and lower it.

Referring to Figures 11 and 13, the lower section 82 of the track. member is provided, near the bottom thereof, with an upset projection 136 that extends into the slot 48. As best shown in Figure 13, projection 136 acts as a stop to limit downward movement of upper sash and prevent it from coming in contact with sill 34.

In order to provide a seal between the storm sash and screen these window elements are provided with a number of laterally extending horizontal ribs that extend from side to side of the elements. Referring to Figure 2, the frame 65 of screen 64 is provided with a pair of ribs 180 and 182 that extend sideways from track member 40 to track member 42 and outwardly into contact with frame 58 of upper storm sash 56 when these elements are in the position shown in Figure 2, and an inwardly extending rib 184 that extends sideways between members 40 and 42 and outwardly to frame 62 of storm sash 63. At the top of sash 63 there is a rib 186 extending from track 40 to track 42 and outwardly to frame 65 of screen 64 and a spring 188 aflixed to frame 62. The spring 188 also extends from track 40 to track 42 and bears against the lower portion of sash 12 to cause the window elements 56, 64 and 61 to be urged toward one another to ensure desired contact between the ribs and window element frames from side to side of these elements. When the parts are positioned as shown in Figure 2, ribs 180, 184 and 186 cooperate with frames 58, 62 and 65 respectively to inhibit passage of atmospheric air to the space between the storm window and the conventional window. The spring 188 is particularly useful as a sealing element in cases where the storm sashes are omitted and a single half screen such as the screen 64 is positioned in tracks 46-50.

Near the bottoms of sashes 56 and 62, there are additional ribs 190 and 192 which provide hand-holds to facilitate manual movement of these window elements. The bottom of screen 64 has a downwardly and outwardly extending rib 194 which provides a hand-hold for movement of the screen. A similar rib 196 is formed at thebottom of storm sash 61 It should be noted that a double seal is provided at the bottom of storm sash 61, since the frame 62 bears against sill 15 and the bottom of rib 196 bears against sill 34.

Turning now to Figures 14-19-of the drawings, these figures show a trim-anchor and storm sash-screen assembly essentially the same as those described previously, but modified for use with wooden-frame windows. Referring particularly to Figure 14, the numeral designates a conventional, double-hung wooden-frame window having the conventional frame 152 and sill 154. Secured to the frame 152 there is a trim-anchor 156 including a laterally extending fin 158 adapted to be used as a nailing strip for securing the trim-anchor 156 to frame 152, and an auxiliary frame 160 within which are mounted, in manner similar to that previously described, an upper storm sash 162, screen 164 and lower storm sash 166. The window elements 162164166 slide in slots of auxiliary frame 160 as previously described, and can be removed therefrom if desired. The mode of removal of lower sash 166 is indicated in phantom in Figure 14.

The construction of the bottom portion of trim-anchor 156 is somewhat different from that of trim-anchor 16. As best shown in Figures 16 and 17, the bottom of trimanchor 156 is provided with an expansion rail 168 comprising the telescoping upper and lower U-shaped members 170 and 172 which are relatively slidable to permit the auxiliary frame of the trim-anchor to be fitted to previously installed window frames of various heights. As indicated in Figure 19, the side rails of the trimanchor 156, as originally formed, may extend somewhat below the expansion rail 168 to form extensions 198. When the trim-anchor is fitted to a conventional window frame 152, the expansion rail is adjusted to cause the lower U-shaped member 172 to be positioned against sill 154, and the extensions 198 of the trim-anchor are cut off flush with the bottom of member 172. The extensions 198 are preferably made at least long enough to extend somewhat below the expansion rail 168 when it is in its most expanded position.

At the bottom of trim-anchor 156 means are provided for removing condensed moisture both from the space between the conventional window and storm sash, and from the interior of the hollow expansion rail. Referring to Figures 15-18, the under side of U-shaped member 172 is recessed at one or more points to define, with sill 154, a number of channels 174 (in this case two) providing a drainage port or weep hole for removal of any water that may condense between the storm sash and window. The member 172 is also provided with the holes 176 which serve as drainage ports for moisture that may condense within expansion rail 168. The holes 176, in addition to acting as drainage ports, provide a convenient opening for insertion of a screw driver or similar tool for the purpose of adjusting the expansion rail in fitting the trim-anchor to the window frame.

It is apparent from the foregoing description that the present invention provides an unusually compact and effective window unit that may be used with or without storm sash and screen. That is to say, the trim-anchor 16 and conventional window frame 10 form a useful subcombination since the trim-anchor includes a nailing strip by means of which the combined structure may be readily mounted in a building opening without the use of relatively complicated anchoring means that have heretofore been generally used. It should be noted that the trimanchor of the construction shown in Figures 1-13 is the sole means for anchoring the conventional window in the window opening. If, after installation of the trimanchor and conventional window it is found desirable to add storm sashes and screens, these additional Window elements may be readily mounted in the auxiliary frame 41 by insertion of the track members 40 and 42.

The storm sash and screen assembly described above possesses numerous practical advantages. By providing separate tracks, for the two storm sashes and the screen, each of these window elements can be independently adjusted and hence a wide variety of ventilating conditions secured. Since the screen is mounted between the two storm sashes it may be moved upwardly behind the upper storm sash (see Figure 2) during the winter months to prevent clogging with snow. The retaining pin 100 permits positive partial opening of the lower storm sash 61 and also acts as a safety device to reduce the likelihood of smashing of the fingers by the descending sash,

since the knob 108 inufst b'efnan'ually grasped and withdrawn before the sash'61 can be in'oved to its lowermost position. The detent 92 retains the window elements in their uppermost position and the loosely mounted springs 110 are exceptionally effective in inhibiting lateral movement of the window elements Within their slots and in preventing rattling of these elements. The heat insulated enclosure 29 has been found to reduce materially the tendency of moisture to condense on the various glass surfaces of the window unit.

It is, of course, to be understood that the foregoing description is intended to be illustrative only and that numerous changes may be made without departing from the scope of the invention. Thus it is apparent that the trim-anchor may be used to support a single conventional window or may be formed as a unitary structure to support two or more such windows. The number of Window elements supported within the auxiliary frame of the trimanchor may be varied as desired, e. g., the screen or one of the storm sashes may be omitted, or a non-movable full screen may be used. The spring-biased detents may be located on only one side of the frame or on both sides thereof, and safety latches may be provided at both sides of the window, or additional vertically spaced latches may be used. The number and arrangement of antirattling springs may also be varied.

Since many embodiments might be made of the present invention and since many changes might be made in the embodiment disclosed herein, it is to be understood that the foregoing description is to be interpreted as illustrative only and not in a limiting sense.

What is claimed is:

1. In a window unit adapted to be mounted in a building opening having a framing for the reception of a window structure in combination, a main window frame, a pair ofwi'ndow sashes mounted in said main window frame, means for securing said main window frame in said building framing and providing an auxiliary frame for receiving an auxiliary sash member comprising a trimanchor secured to the periphery of said main window frame, said trim-anchor including an outwardly extending fin providing a nailing strip for attachment of said trim-anchor and main window frame to the framing of said building opening as well as a forwardly extending fin cooperating with an adjacent portion of said main window frame to form said auxiliary frame and an auxiliary sash mounted in said auxiliary frame.

2. In a window unit adapted to be mounted in a building opening having a framing for the reception of a window structure in combination, a main window frame, a p'air-of window sashes mounted in said main window frame, means 'for securing said main window frame in said building framing and providing an auxiliary frame for receiving an auxiliary sash member comprising a generally rectangular trim-anchor secured to the periphery of said main window frame, said trim-anchor including an outwardly extending fin extending around the sides and top of said trim-anchor and providing a nailing strip for attachment of said trim-anchor and main window frame to the framing of said building opening, said trim-anchor also including a forwardly extending fin cooperating with an adjacent portion of said main window frame to form said auxiliary frame, and a plurality of window elements slidably mounted in said auxiliary frame.

3. In a Window unit adapted to be mounted in a building opening in combination, a window frame, a pair of window sashes mounted in said window frame, a trimanchor secured to the periphery of said window frame, said trim-anchor including an outwardly extending fin providing a nailing strip for attachment of said trimanchor and window frame to the peripheral portion of said building opening as well as a forwardly extending fin cooperating with an adjacent portion of said window frame to 'form an auxiliary frame adapted to receive a storm sash, and a "pair of spacing members interposed between said trim-anchor and window frame and defining therewith an enclosure containing a heat insulatingniate'ria'l.

"4. In a window u'n'itada'pted to be'mounted in a building opening having a fr'a'ming'for the reception'o'f a window structure in combination, a window frame, a .pair

of window sashes mounted in said main window'frarne, means for securing said main window'frame in said building framing and providing anauxiliary framefor receiving an auxiliary sash member comprising a trim-anchor secured to the periphery of said main window frame, said trim-anchor including an outwardly extending finproviding a nailing strip for attachment of said trim-anchor and main window frame to the peripheral portion of said building opening framing as well as a forwardly extending fin defining said auxiliary window frame including interior slots adapted to receive auxiliary window elements such as storm sash and screen, said trim-anchor providing the sole means of anchoring said main window rame.

'5. In a window unit adapted to be mounted in a building opening in combination, a window frame, a pair of window sashes mounted in said window frame, a trimanchor secured to the periphery of said window frame, said trim-anchor including an outwardly extending fin providing a nailing strip for attachment of said trimanchor and window frame to the peripheral portion of said building opening as well as a forwardly extending fin cooperating with an adjacent portion of said window frame to form an auxiliary frame adapted to receive a storm sash, and a .pocket'member located between said trim anchor and said first mentioned window frame for the reception of insulating material. I

'6. In a window unit adapted to be mounted in a building opening having a framing for the reception of a window structure in combination, a main window frame, a pair of window sashes mounted in said main window frame, means for securing said main window frame in said building framing and providing an auxiliary frame for receiving auxiliary sash members, said auxiliary frame comprising a trim anchor secured to said main window frame, said trim-anchor having side and top flanges extending outwardly from said main window frameand means for securing said trim-anchor to said building framing and removable members mounted in said trimanchor for receiving said auxiliary sash members.

7. The combination of elements recited 'in claim 6 wherein said trim-anchor is provided with flanges for guiding the outer of said auxiliary sashes in its sliding movements.

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